Increasing drought, less precipitation, rising water demand in agriculture—climate change is causing problems for our groundwater. In Germany and around the world, it is leading to falling groundwater levels in some regions. When the underground water table is low, polluted surface water from streams and rivers finds its way more and more into the groundwater. The result: Our drinking water and groundwater ecosystems are endangered—making a problem of quantity a problem of quality too. This is what researchers are currently describing in the scientific journal Water Research. Their recommendation: new research approaches and regionally adapted concepts to improve groundwater formation.